Power Conversion Control System and Method for Hydrogen Production by Electrolyzing Water

Abstract

The present invention provides a power conversion control system and method for hydrogen production by electrolysis of water. The system includes an equivalent circuit parameter measurement unit for measuring the equivalent circuit parameters of different types of electrolyzers; a maximum power transmission efficiency electrolyzer load curve calculation unit for fitting a power conversion circuit-electrolyzer load optimal efficiency curve based on the equivalent circuit parameters of different types of electrolyzers; and a control unit for receiving the power conversion circuit-electrolyzer load optimal efficiency curve sent by the maximum power transmission efficiency electrolyzer load curve calculation unit and controlling the power conversion circuit and electrolyzer hydrogen production according to the curve to provide power output to the electrolyzer, thereby achieving an output current according to the power conversion circuit-electrolyzer optimal efficiency curve. The present invention controls the system with the goal of maximizing system efficiency, thereby improving the overall efficiency of the power conversion circuit-electrolyzer. This provides a highly efficient power conversion control system and method for water electrolysis using renewable energy.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a power conversion control system and method for hydrogen production by electrolysis of water. Background Art

[0002] With growing attention paid to hydrogen energy both internationally and domestically, various hydrogen production methods have made significant progress, but none of them can be separated from the power supply-electrolysis process. As is well known, hydrogen production through water electrolysis is highly energy-intensive, making efficiency extremely important. Currently, the technical route of utilizing renewable energy power generation to produce hydrogen through water electrolysis has been highly valued by numerous scholars and companies, and is a key path to achieving low-carbon emissions and hydrogen production in the future. Currently, hydrogen production through water electrolysis primarily targets hydrogen purity and yield, resulting in high energy consumption. Improving the efficiency of the water electrolysis process is a key technical challenge in achieving a future hydrogen society. The volatility of renewable energy power generation can lead to reduced power quality during the water electrolysis process, resulting in an imbalance between the power source and the load, leading to serious production accidents. Therefore, there is an urgent need to address the input / output issues associated with the renewable energy power generation-water electrolysis hydrogen production system. Summary of the Invention

[0003] In order to solve the problems in the prior art, the embodiments of the present invention provide a power conversion control system and method for producing hydrogen by electrolysis of water.

[0004] Specifically, the embodiments of the present invention provide the following technical solutions:

[0005] In a first aspect, an embodiment of the present invention provides a power conversion control system for hydrogen production by electrolysis of water, comprising: an electrolyzer load curve calculation unit for maximum power transmission efficiency, a control unit, a communication unit, an equivalent circuit parameter measurement unit, a new energy power generation system, a power conversion circuit, and an electrolyzer;

[0006] The equivalent circuit parameter measuring unit is used to measure the equivalent circuit parameters of different types of electrolytic cells;

[0007] The electrolytic cell load curve calculation unit of the maximum power transmission efficiency is used to fit the power conversion circuit-electrolytic cell load optimal efficiency curve according to the equivalent circuit parameters of different types of electrolytic cells;

[0008] The control unit is configured to receive the power conversion circuit-electrolyzer load optimal efficiency curve sent by the electrolyzer load curve calculation unit for maximum power transmission efficiency, and control the power conversion circuit and the hydrogen production of the electrolyzer according to the curve to provide power output for the electrolyzer, so as to achieve an output current of the power conversion circuit-electrolyzer optimal efficiency curve;

[0009] The new energy power generation system is used to supply power to the power conversion circuit;

[0010] The power conversion circuit is used to provide power output for the electrolytic cell under the control of the control unit.

[0011] Furthermore, the power conversion circuit-electrolyzer load optimal efficiency curve is a nonlinear curve of hydrogen production and current;

[0012] Among them, one hydrogen production amount corresponds to a current value with the highest efficiency of the power conversion circuit-electrolyzer. When the entire system operates on this optimal curve, it means entering the optimal efficiency curve control mode.

[0013] Furthermore, the power conversion circuit is also used to switch to a DC side voltage stabilization control mode when the input power fluctuates or changes, so as to ensure the DC power supply quality of the electrolyzer.

[0014] Furthermore, the change in the hydrogen production amount varies according to the change in the hydrogen demand amount due to the production load.

[0015] In a second aspect, an embodiment of the present invention further provides a power conversion control method for hydrogen production by electrolysis of water based on the power conversion control system for hydrogen production by electrolysis of water as described in the first aspect, comprising:

[0016] S1. Measure the equivalent circuit parameters of different types of electrolytic cells;

[0017] S2. Fitting the power conversion circuit-electrolyzer load optimal efficiency curve based on the equivalent circuit parameters of different types of electrolyzers and inputting it into the control unit;

[0018] S3. When the hydrogen production amount changes, the output current is adjusted according to the adjusted power conversion circuit-electrolyzer load optimal efficiency curve;

[0019] S4. When the input power fluctuates or changes, it should switch to voltage stabilization control.

[0020] Furthermore, the power conversion circuit-electrolyzer load optimal efficiency curve is a nonlinear curve of hydrogen production and current;

[0021] Among them, one hydrogen production amount corresponds to a current value with the highest efficiency of the power conversion circuit-electrolyzer. When the entire system operates on this optimal curve, it means entering the optimal efficiency curve control mode.

[0022] Furthermore, the change in the hydrogen production amount varies according to the change in the hydrogen demand amount due to the production load.

[0023] Furthermore, with the goal of obtaining the maximum system efficiency, the optimal efficiency curve and voltage stability control modes are used to respectively deal with the impact of output and input on the system.

[0024] As can be seen from the above technical solutions, the power conversion control system and method for hydrogen production by electrolysis provided in the embodiments of the present invention are suitable for power conversion occasions for hydrogen production by electrolysis of water, as well as for high-efficiency power conversion occasions between high-current power sources and loads. The control is performed with the goal of maximizing system efficiency, thereby improving the overall efficiency of the power conversion circuit-electrolyzer. The system is an efficient power conversion control system and method for electrolysis of water using new energy.

[0025] In addition, the power conversion control system and method for hydrogen production by electrolysis provided by the embodiments of the present invention automatically switches to voltage stabilization control when the input power fluctuates or changes. Thus, the power conversion control system and method for hydrogen production by electrolysis provided by the embodiments of the present invention, with the goal of maximizing system efficiency, can also be implemented in situations such as fluctuations in renewable energy power generation, thereby improving the overall efficiency of the power conversion circuit-electrolyzer. This is a highly efficient power conversion control system and method for water electrolysis by renewable energy power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 1 is a schematic structural diagram of a power conversion control system for producing hydrogen by electrolysis of water provided in one embodiment of the present invention;

[0028] Figure 2 The present invention provides a flow chart of a power conversion control method for producing hydrogen by electrolysis of water according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] The present invention is a novel power conversion system and control method that primarily addresses the issue of improving system efficiency for hydrogen production by water electrolysis. Specifically, the present invention provides a power conversion system and control method for hydrogen production by water electrolysis, which are applicable to power conversion applications for hydrogen production by water electrolysis, high-efficiency power conversion between high-current power sources and loads, and fluctuating power generation from renewable energy sources such as wind and solar power. The solutions provided by the present invention are explained below through specific embodiments.

[0031] Figure 1 1 is a schematic structural diagram of a power conversion control system for producing hydrogen by electrolysis of water provided in one embodiment of the present invention; Figure 2 FIG. 1 is a flow chart of a power conversion control method for producing hydrogen by electrolysis of water according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the power conversion control system for hydrogen production by electrolysis of water provided by an embodiment of the present invention includes: an electrolyzer load curve calculation unit 1 for maximum power transmission efficiency, a control unit 2, a communication unit 3, an equivalent circuit parameter measurement unit 4, a new energy power generation system 5, a power conversion circuit 6 and an electrolyzer 7;

[0032] The equivalent circuit parameter measuring unit is used to measure the equivalent circuit parameters of different types of electrolytic cells;

[0033] The electrolytic cell load curve calculation unit of the maximum power transmission efficiency is used to fit the power conversion circuit-electrolytic cell load optimal efficiency curve according to the equivalent circuit parameters of different types of electrolytic cells;

[0034] The control unit is configured to receive the power conversion circuit-electrolyzer load optimal efficiency curve sent by the electrolyzer load curve calculation unit for maximum power transmission efficiency, and control the power conversion circuit and the hydrogen production of the electrolyzer according to the curve to provide power output for the electrolyzer, so as to achieve an output current of the power conversion circuit-electrolyzer optimal efficiency curve;

[0035] The new energy power generation system is used to supply power to the power conversion circuit;

[0036] The power conversion circuit is used to provide power output for the electrolytic cell under the control of the control unit.

[0037] Furthermore, based on the contents of the above embodiments, in this embodiment, the power conversion circuit-electrolyzer load optimal efficiency curve is a nonlinear curve of hydrogen production and current; this curve is obtained by measuring the equivalent circuit parameters of different types of electrolyzers, and then fitting the power conversion circuit-electrolyzer load optimal efficiency curve according to the equivalent circuit parameters of different types of electrolyzers.

[0038] In this embodiment, it should be noted that the efficiency of the electrolytic cell load, as the power supply object of the power conversion circuit, is related to the input current, which in turn is related to the equivalent circuit of the electrolytic cell.

[0039] The optimal efficiency can be understood as the maximum value of hydrogen production / electricity. Under the same hydrogen production amount, there may be different system configurations, but there is only one configuration that corresponds to the minimum electricity or the minimum current.

[0040] The optimal efficiency curve is obtained through actual testing. With the power conversion circuit and electrolyzer unchanged, the power conversion circuit supplies different input currents to the electrolyzer. The electrolyzer's equivalent circuit parameters and actual efficiency are then tested to obtain a current-efficiency curve. The optimal efficiency curve is then fitted according to the above instructions.

[0041] Then, during the actual operation of the electrolyzer, according to the demand for hydrogen production, the optimal efficiency curve can be queried to obtain the corresponding current and maximize efficiency.

[0042] Among them, one hydrogen production amount corresponds to a current value with the highest efficiency of the power conversion circuit-electrolyzer. When the entire system operates on this optimal curve, it means entering the optimal efficiency curve control mode.

[0043] Furthermore, based on the contents of the above embodiments, in this embodiment, the power conversion circuit is also used to switch to the DC side voltage stabilization control mode when the input power fluctuates or changes, so as to ensure the DC power supply quality of the electrolyzer.

[0044] Furthermore, based on the content of the above embodiment, in this embodiment, the change in the hydrogen production amount varies according to the change in the hydrogen demand amount due to the production load.

[0045] In this embodiment, it should be noted that this embodiment is applied to power conversion applications for hydrogen production by electrolysis of water, as well as high-efficiency power conversion applications between large current power sources and loads, with the goal of maximizing system efficiency. At the same time, it can also be applied to applications such as power fluctuations in renewable energy generation, thereby improving the overall efficiency of the power conversion circuit-electrolyzer. This is an efficient power conversion control system for renewable energy generation and water electrolysis. Figure 1 As shown, 1 is the electrolytic cell load curve calculation unit for maximum power transmission efficiency, 2 is the control unit, 3 is the communication unit, 4 is the equivalent circuit parameter measurement unit, 5 is the new energy power generation system, 6 is the power conversion circuit, and 7 is the electrolytic cell. Among them, 1 is connected to 2, and 1 is used as the initial calculation value; 3 is connected to 2, 4 is connected to 7, and data interaction is achieved through 3 and 2; 6 is connected to 5 and 2. The control method flow chart corresponding to this system is shown in the figure. Figure 2 shown.

[0046] It is understandable that when the amount of hydrogen produced changes, the electrolyzer load curve that provides maximum power transmission efficiency will also change. In this case, the power conversion circuit is required to adjust the output current according to the adjusted power conversion circuit-electrolyzer load optimal efficiency curve, thereby achieving the output current of the power conversion circuit-electrolyzer optimal efficiency curve. When the input power fluctuates or changes, the power conversion circuit should switch to the DC side voltage stabilization control mode to ensure the DC power supply quality of the electrolyzer.

[0047] It should be noted that the change in hydrogen production capacity varies according to the changes in hydrogen demand due to production load. The power conversion circuit-electrolyzer load optimal efficiency curve is a nonlinear curve of hydrogen production capacity and current. Therefore, a given hydrogen production capacity corresponds to a current value that maximizes the power conversion circuit-electrolyzer efficiency. When the entire system operates along this optimal curve, it enters optimal efficiency curve control mode.

[0048] In this embodiment, the DC-side voltage stabilization control of the power conversion circuit is implemented when the input power varies or fluctuates. Its primary purpose is to maintain power stability and minimize the impact of the power supply on the electrolyzer. As can be seen, to maximize system efficiency, the optimal efficiency curve and voltage stabilization control modes are used to address the impact of output and input on the system, respectively.

[0049] Another embodiment of the present invention provides a power conversion control method for producing hydrogen by electrolysis of water based on the power conversion control system for producing hydrogen by electrolysis of water as described in the above embodiment, such as Figure 2 As shown, the method includes the following processing steps:

[0050] S1. Measure the equivalent circuit parameters of different types of electrolytic cells;

[0051] S2. Fitting the power conversion circuit-electrolyzer load optimal efficiency curve based on the equivalent circuit parameters of different types of electrolyzers and inputting it into the control unit;

[0052] S3. When the hydrogen production amount changes, the output current is adjusted according to the adjusted power conversion circuit-electrolyzer load optimal efficiency curve;

[0053] S4. When the input power fluctuates or changes, it should switch to voltage stabilization control.

[0054] In this embodiment, it can be understood that the power conversion circuit-electrolyzer load optimal efficiency curve is a nonlinear curve of hydrogen production and current;

[0055] Among them, one hydrogen production amount corresponds to a current value with the highest efficiency of the power conversion circuit-electrolyzer. When the entire system operates on this optimal curve, it means entering the optimal efficiency curve control mode.

[0056] In this embodiment, it can be understood that the change in the hydrogen production amount varies according to the change in the hydrogen demand amount due to the production load.

[0057] In this embodiment, it can be understood that, with the goal of obtaining the maximum system efficiency, the optimal efficiency curve and voltage stability control modes are adopted to respectively handle the impact of output and input on the system.

[0058] As can be seen from the above technical solutions, the present invention relates to a power conversion circuit for hydrogen production by water electrolysis and its control method, which are applicable to power conversion applications for hydrogen production by water electrolysis, high-efficiency power conversion between high-current power sources and loads, and fluctuating power generation by renewable energy sources such as wind and solar power. The power conversion circuit comprises: a power conversion circuit, a control unit, an equivalent circuit parameter measurement unit, a communication unit, etc. The method includes: when the hydrogen production volume changes, the electrolyzer load curve that provides maximum power transmission efficiency will change. In this case, the power conversion circuit is required to adjust the output current according to the adjusted power conversion circuit-electrolyzer load optimal efficiency curve, thereby achieving the output current of the power converter-electrolyzer optimal efficiency curve. When the input power fluctuates or changes, the power converter switches to a DC side voltage stabilization control mode to ensure the DC power supply quality of the electrolyzer. This invention aims to maximize system efficiency while also being applicable to situations such as fluctuating power generation from renewable energy sources, improving the overall efficiency of the power conversion circuit-electrolyzer, and thus providing a highly efficient power conversion control method for water electrolysis by renewable energy sources.

[0059] In addition, in the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0060] In addition, in the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A power conversion control system for hydrogen production by water electrolysis, characterized in that: include: An electrolytic cell load curve calculation unit for maximum power transmission efficiency, a control unit, a communication unit, an equivalent circuit parameter measurement unit, a new energy power generation system, a power conversion circuit, and an electrolytic cell; The equivalent circuit parameter measuring unit is used to measure the equivalent circuit parameters of different types of electrolytic cells; The electrolytic cell load curve calculation unit of the maximum power transmission efficiency is used to fit the power conversion circuit-electrolytic cell load optimal efficiency curve according to the equivalent circuit parameters of different types of electrolytic cells; The control unit is configured to receive the power conversion circuit-electrolyzer load optimal efficiency curve sent by the electrolyzer load curve calculation unit for maximum power transmission efficiency, and control the power conversion circuit and the hydrogen production of the electrolyzer according to the curve to provide power output for the electrolyzer, so as to achieve an output current of the power conversion circuit-electrolyzer optimal efficiency curve; The new energy power generation system is used to supply power to the power conversion circuit; The power conversion circuit is used to provide power output for the electrolytic cell under the control of the control unit; The power conversion circuit-electrolyzer load optimal efficiency curve is a nonlinear curve of hydrogen production and current; Among them, one hydrogen production amount corresponds to a current value with the highest efficiency of the power conversion circuit-electrolyzer. When the entire system operates on this optimal curve, it means entering the optimal efficiency curve control mode.

2. The power conversion control system for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The power conversion circuit is also used to switch to a DC side voltage stabilization control mode when the input power fluctuates or changes, thereby ensuring the DC power supply quality of the electrolyzer.

3. The power conversion control system for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The change in the hydrogen production amount varies according to the change in the hydrogen demand due to the production load.

4. A power conversion control method for producing hydrogen by electrolysis of water based on the power conversion control system for producing hydrogen by electrolysis of water according to any one of claims 1 to 3, characterized in that: include: S1. Measure the equivalent circuit parameters of different types of electrolytic cells; S2. Fitting the power conversion circuit-electrolyzer load optimal efficiency curve based on the equivalent circuit parameters of different types of electrolyzers and inputting it into the control unit; S3. When the hydrogen production amount changes, the output current is adjusted according to the adjusted power conversion circuit-electrolyzer load optimal efficiency curve; S4. When the input power fluctuates or changes, it should switch to voltage stabilization control; The power conversion circuit-electrolyzer load optimal efficiency curve is a nonlinear curve of hydrogen production and current; Among them, one hydrogen production amount corresponds to a current value with the highest efficiency of the power conversion circuit-electrolyzer. When the entire system operates on this optimal curve, it means entering the optimal efficiency curve control mode.

5. The power conversion control method for producing hydrogen by electrolysis of water according to claim 4, characterized in that: The change in the hydrogen production amount varies according to the change in the hydrogen demand due to the production load.

6. The power conversion control method for producing hydrogen by electrolysis of water according to claim 4, characterized in that: With the goal of maximizing system efficiency, the optimal efficiency curve and voltage stability control modes are used to respectively handle the impact of output and input on the system.

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